Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7455087 | Electric sharpener for writing instruments | Chung Ming Mak, Ronald Mak | 2008-11-25 |
| 6898856 | Letter opener | Chung Yin Ronald Mak, Chung Ming Mak | 2005-05-31 |
| 6637481 | Apparatus for sharpening a writing instrument | Chung Yin Ronald Mak, Chung Ming Mak | 2003-10-28 |
| 6397480 | Mechanism for sharpening a writing instrument | Chung Yin Ronald Mak, Chung Ming Mak | 2002-06-04 |
| D457190 | Clip dispenser | Chung Yin Ronald Mak, Chung Ming Mak | 2002-05-14 |
| D452531 | Clip dispenser | Chung Yin Ronald Mak, Chung Ming Mak | 2001-12-25 |
| D434444 | Pencil sharpener casing | — | 2000-11-28 |
| 5993188 | Food extruding device | — | 1999-11-30 |
| D405830 | Electric pencil sharpener | — | 1999-02-16 |